The my sky app is not as complicated as sky go and what BT do has zero relevance
Edit: upon checking the My Sky update history on the App Store there is no mention of an update specifically for the X
even if sky do update go for X it’ll just distort the picture as the X does not have a 16:9 screen
I’m still waiting for sky go to be updated to use the iPad pro 12.9” native onscreen keyboard and that device as been available for over 2 years